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研究了与甜菊干叶产量（Ｙ）有密切关系的６个数量性状（株高ｘ１、茎粗ｘ２、分枝数ｘ３、主茎节数ｘ４、单株叶片数ｘ５、肉质根条数ｘ６）及它们之间的相互关系。通径分析结果表明，这６个性状对干叶产量的直接影响依次为ｘ３＞ｘ４＞ｘ５＞ｘ１＞ｘ６＞ｘ２，它们与干叶产量的回归关系为，Ｙ＝９７９５５１－００４８２１５ｘ１－０７８８２１ｘ２＋０１１６４１ｘ３＋０５７３０７２ｘ４＋０００８２２８６ｘ５－０００９０７１７ｘ６。用此方程预测干叶产量，其可靠程度可达Ｒ２＝０９９９８８９４。
Six quantitative traits (plant height x1, stem diameter x2, number of branches x3, number of main stems x4, number of leaves per plant x5, number of fleshy roots x6) closely related to the dry matter yield (Y) And the interrelationships between them. The results of path analysis showed that the direct effects of these six traits on dry leaf yield were x3> x4> x5> x1> x6> x2, and the regression relationship between them and dry leaf yield was Y = 979551-0048215x1 -078821x2 +011641x3 +0573072x4 +00082286x5-00090717x6. Use this equation to predict dry leaf yield, its reliability can reach R2 = 09998894.